Steam-boiler



(No Model.) E. P. MGGERR.

STEAM BOILER.

No. 539,635'. Patentedlvray 21,1895.

NITED STATESA PATENT OFFICE EDWARD P.- MCGERR, OF JERSEY CITY, NEW.JERSEY.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 539,635, dated May 21, 1895. Applotl filed November l, 3.891;l Serial No. 527,649. (No model.)

To all 'whom t may concern.-

Be it known that I, EDWARD P. MOGERR, a citizen of the United States, residing at Jersey City, in the countyv of Hudson, New Jersey, have invented certain new and useful Im' provementsin Steam-Boilers, of which the following is a specification, reference being had therein to the accompanying drawing. n,

This improvement relates to that classhof boilers known as water tube boilers, and isdesigned to provide a boiler of this class which shall be simple in construction, durable vand economical in use, and rapid in forming steam. To these ends the invention consists in the peculiar construction hereinafter described, the novel points of which are definitely pointed out at the end hereof.

The accompanying drawing shows a vertical central section of a boiler constructed ac` cording to my improvement with part thereof in elevation.

In the drawing, A represents a brick base, having a iiue B to carry off the products of combustion.` Resting upon this base is the boiler C, consisting of a lower annular cylindrical portion D, to which is attached an upper portion in the form of an inverted hollow trunacted cone E, formed of two tapering shells F G connected together at top by a hanged head H. The two shells forming the annular cylindrical portion are also connected by a similar head.

The boiler may rest directly on the base, but I prefer to attach at its lower end a cast flange I, which rests on the brick base and thus supports the boiler. At a proper distance above this another ange I is secured to support the inner ends of the gate-bars J, which are arranged radially around the boiler, and their other ends are supported by a flange K, at tached to an outer fire-proof jacket L, which surrounds the entire boiler. This jacket is of cylindrical form and covered with a canopy top M, which is air-tight and of any suitable fire-proof material, and to save heat, if of metal, it may be covered with any poor heat conductor. At suitable distances apart around lthis jacket are doors Npfor feeding the fire, al'd vat O are-shown other doors for removing ashes, &c.

Withinl the boiler are one or more coils of pipes P, connected at top and bottom with theinner shell as shown;

Arranged around the outershell arev several seriesof U-shaped tubes Q, yand connected at both ends with theinterior of the boiler by .being expanded into the outer shellV of the rso above the grate-bars, and the upper ends of the upper series extend above the waterline. They are set so as to incline at about twenty-two and one-half degrees from a vertical line. The bottom arms of the tubes are rather longer than the upper, so that the tubes set substantially horizontal.

The boiler is,of course, to be fitted with the usual attachments, such as steaml and water gages, safety-valve, dac., but as there is nothing new claimed in these, it is unnecessary to describe or show them.

The operatiouisas follows: The boiler being filled with water to the proper level, and the tire started, the heated products of combustion rise through the large assemblage of tubes on the outside of the boiler, and pass over the top, down through the center, and out through the flue B,as shown bythe arrows. As

the heat rises it will naturallyimpinge against and cling to the inclined surface of the outer shell, and in going down the center the same effect is produced. The different rings of the coil of tubes inside the boiler are also struck successively by the descending heat as well as the inclined tubes on the outside of the shell, and this effect is intensified by the concentration of the heat as it rises on the outside of the boiler and descends on the inside, because the space decreases toward the top of the outside'of the boiler and also on the inside toward the bottom. TheV heat is consequently concentrated about the surface of the inclined tubes and the inside coils, and thus greatly hastens the circulation of the water and the generation of steam, andthe products of comtubes, and the water in them begins to circul roo late and steam generation begins-the steam rising to the top of the boiler toward the steam d space, and the water, if any rises with it, dropping back to the water-level.

The mud, sediment, duc., which may settle in the bottom of the boiler may be blown oft by the usual appliances.

I do not limit myself to a boiler in the eX- act shape shown in the accompanying drawing only. It may be inverted and used as an oil burner, and thereby become valuable as a marine boiler, or for other uses. If inverted, the heat should pass up through the center and then down the outside.

What I claim as new isl. A boiler provided with two tapering shells, having their smallest parts downward aud set one within the other, an outer shell forming a fire-chamber, a canopy top to direct the products of combustion into the central inner shell, and a flue to carry them away, substantially as described.

2. A boiler provided with two tapering shells, having their smallest parts downward and set one within the other, an outer shell surrounding the tire-chamber, a canopy to direct the products of combustion toward the central inner shell, and a flue below the drechamber to draw down said products ot' combustion through said inner shell, substantially as described.

3. A boiler having a down-draft central passage and a coil of pipe of gradually decreasing diameter of coil arranged within the same having its upper and lower ends connected with the boiler near its topand bottom respectively, substantially as described.

4. A boiler having a tapering central downdraft passage and conical coils of pipes arranged within the same and having their upper and lower ends connected with the boiler near its top and bottom respectively, substantially as described.

5. In a boiler, the combination with inner and outertapering shells, of a series of inclined tubes passing through the outer shell, and a series of coils inside the inner shell, both tubes and coils communicating with the Space between the shells, substantially as described.

6. The combination in aboiler, of inner-and outer tapering shells, an outer shell surrounding the tire-chamber, and a down draft flue for the same, arranged to concentrate the products of combustion as the heat thereot` decreases, substantially as described.

7. The combination with a vertical boiler having a central passage through it, ot' a crcular furnace surrounding said boiler, and a iiue to draw the products of combustion down said central passage, substantially as described.

8. The combination in a boiler, of the inner and outer shells, the inclined tubes connected to the outer shell, the coils contained in the inner shell, the circular furnace surrounding the boiler, a jacket surrounding the entire boiler, and a tlue to draw the products of com bustion down the central passage, all substair tially as described and shown.

In testimony whereof I atlix my signature, in presence of two witnesses, this'Oth day of October, A. D. 1894.

EDWARD P. MCGERR.

Witnesses:

RICHARD J. ONEILL, DAVID BIRDSALL. 

